Wanhao Duplicator 6 - Board fan duct
thingiverse
Replace the board fan's intake with a fresh air source, allowing it to draw in cool air instead of re-circulating hot air. This modification is specifically designed for fans measuring 40x20mm and 40x10mm. When paired with the PSU fan duct (https://www.thingiverse.com/thing:3392313), overall cooling performance improves.
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